I went to the Alameda Swap Market this past weekend. (If you haven't been, I recommend a visit, just to marvel at its scale and authenticity.) It's at Alameda and 45th Street. There are many food choices in the market, and from street vendors everywhere around it.
At one of these street vendors, we saw and tried something I'd never eaten before and thought was among the best examples of tasty street food I've ever had, anywhere in the world. (I was a foreign correspondent for many years, and so have been to a lot of places and eaten a lot off the streets.)
The vendor told me the name, but I couldn't quite grasp it. She takes a handful of fresh, green-colored dough. She then folds into any combination of meat, cheese and/or beans. She flattens it out to make something the color and shape of a green oval cactus leaf, and puts them on the hot un-oiled griddle to cook. It takes about 2 minutes, and you then top it with a great salsa, grated cheese, fresh onions and cilantro. Cost: 2 bucks.
How to find her? Turn right onto Vernon Street from Alameda (in other words, go west on Vernon.) You'll pass the market on your left. She's set up about a block further along, on the southside of the street, before the big intersection with Long Beach Ave.
Next to her, at least on Sunday, was another vendor selling homemade Pan de Fiesta. It was wonderful also.